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PERFECT COMPETITION CHARACTERISTICS: The four key characteristics of perfect competition are: (1) large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology. These four characteristics mean that a given perfectly competitive firm is unable to exert any control whatsoever over the market.

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CHANGE IN AGGREGATE DEMAND

A shift of the aggregate demand curve caused by a change in one of the aggregate demand determinants. A change in aggregate demand is caused by any factor affecting aggregate demand EXCEPT the price level. This is one of two changes related to aggregate demand. The other is a change in aggregate expenditures. A change in aggregate demand is comparable to a change in market demand.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites hoping to buy either a 50-foot blue garden hose or a turbo-powered vacuum cleaner. Be on the lookout for jovial bank tellers.
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In the early 1900s around 300 automobile companies operated in the United States.
"In war, there is no second prize for the runner-up."

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